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What are surds and how does multiplying them work?

A surd is an irrational number which cannot be expressed as a fraction or a recurring number. E.g. root 2 = 1.4142135…. and it continues (but it does NOT repeat like a recurring fraction though)

FS
Answered by Febi S. • Maths tutor
7821 Views

You added 75cm^3 of 0.5moldm^-3 HCl to impure MgCO2, and some was left unreacted. The unreacted HCl reacted completely with 21.6cm^m of 0.5moldm^-3 NaOH. So what is the percentage purity of the MgCO3 sample?

MgCO3 +2HCl --> MgCl2 + H2O +CO2

For this kind of question, I would always try to convert what I can into moles because tha...

FS
Answered by Febi S. • Chemistry tutor
8064 Views

How does a deletion of a base in the DNA base sequence lead to a mutated protein?

It is important to note that bases on the DNA (and mRNA) are read in separate sets of 3s along a DNA/(mRNA) stand (this is called a triplet code in DNA, or the codon in mRNA). So, if a base is deleted,...

FS
Answered by Febi S. • Biology tutor
15537 Views

How do I use the product rule for differentiation?

The product rule is a rule for differentiating products of expressions, i.e. 2 expressions multiplied together. 

The rule is: if y=AB, then dy/dx=AdB/dx +B*dA/dx. This can be rem...

TE
Answered by Thomas E. • Maths tutor
8022 Views

How do I approach an essay question?

The layout of your essay is crucial. Make sure your ideas are clear and explicit - your teacher shouldn't have to decode what you mean! Use correct grammar and make your vocabulary interesting, using word...

CB
Answered by Caitlin B. • History tutor
5985 Views

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